Based on the results obtained in the investigation for cyclohexane recovery by extractive distillation with single solvent,and the Wsy-1 mixed solvent was experimentally studied.The effects of cyclohexanol concentrati...Based on the results obtained in the investigation for cyclohexane recovery by extractive distillation with single solvent,and the Wsy-1 mixed solvent was experimentally studied.The effects of cyclohexanol concentration in solvent,cyclohexane concentration in feed and solvent-to-feed ratio on relative volatility were investigated. The relative volatility of n-heptane/cyclohexane was increased from 0.661 to 1.11, and that of 2,3-dimethylpentane/cyclohexane increased from 0.84 to 1.21 at the Wsy-1 solvent-to-feed ratio of 7∶1. The cyclohexane purity and recovery were 98.5% and 80%, respectively, when a feed stream consisting of 85% cyclohexane was introduced to the experimental extractive distillation column operating at the reflux ratio of 10.展开更多
A SPE/GC-MS method for separation and determination of carbazoles in crude oil was developed.Alumina and silicic acid solid-phase extraction(SPE) columns were used to separate resin from crude oil and neutral nitrogen...A SPE/GC-MS method for separation and determination of carbazoles in crude oil was developed.Alumina and silicic acid solid-phase extraction(SPE) columns were used to separate resin from crude oil and neutral nitrogen compounds from nitrogen riched resin.Carbazole and its alkylation series were quantitatively analysed by use of deuterate carbazole as an internal standard and the 9-benzocarbazole as an recovery rate standard.The modified method was very suitable for batch processing in organic geochemistry owing to its low cost,time saving,environmental friendliness.展开更多
文摘Based on the results obtained in the investigation for cyclohexane recovery by extractive distillation with single solvent,and the Wsy-1 mixed solvent was experimentally studied.The effects of cyclohexanol concentration in solvent,cyclohexane concentration in feed and solvent-to-feed ratio on relative volatility were investigated. The relative volatility of n-heptane/cyclohexane was increased from 0.661 to 1.11, and that of 2,3-dimethylpentane/cyclohexane increased from 0.84 to 1.21 at the Wsy-1 solvent-to-feed ratio of 7∶1. The cyclohexane purity and recovery were 98.5% and 80%, respectively, when a feed stream consisting of 85% cyclohexane was introduced to the experimental extractive distillation column operating at the reflux ratio of 10.
文摘A SPE/GC-MS method for separation and determination of carbazoles in crude oil was developed.Alumina and silicic acid solid-phase extraction(SPE) columns were used to separate resin from crude oil and neutral nitrogen compounds from nitrogen riched resin.Carbazole and its alkylation series were quantitatively analysed by use of deuterate carbazole as an internal standard and the 9-benzocarbazole as an recovery rate standard.The modified method was very suitable for batch processing in organic geochemistry owing to its low cost,time saving,environmental friendliness.